"versions" only refer to STI models in JDM land and are only a term used in the enthusiast world. "versions" stopped after version 6. please do not refer to non-sti as "versions" as you will not get a proper answer as people will think your talking about JDM STI's. also dont use "versions" to talk about USDM models as the "versions" are completely different.
your answer has two answers
JDM - version 7 is single scroll and version 8 is twin scroll. the 02 sensor is in a comepletely different spot and the wire wont reach.
USDM - its the exact same part 02-05 yes it will fit.
again please only use "versions" to describe JDM STI's, and even then you should us the GDB Rev A-F designations. also they never made a "version 8" wagon. STI wagons ended with version 6 in 99-00
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